. >> reporter: a duty that made him the first line of defense when it comes to airport security. according to tsa administrator john pistole. >> we want to do what we can to support and work with, again, the police to make sure we're doing everything possible to prevent something like this happening again. >> reporter: with l.a.x. back in full operation, authorities continue to search for clues as to what led to the violence. dan sheneman, nbc news. >>> new this morning, u.s. secretary of state john kerry met with egyptian foreign minister in cairo. it is his first trip to egypt since the military ousted the country's democratically-elected president in july. kerry said the u.s. is a friend and partner to the egyptian people and wants to contribute to the country's success. in an interview ahead of the secretary of state's visit, the prime minister said he intended to have frank and honest talks with kerry. he arrived before mohamed morsi and 14 other top brotherhood leaders go on trial. kerry's visit to cairo is the first stop in a nine-day trip to the middle east, eastern europ